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51. How is C₄ pathway more energy expensive that C₃ ?

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Chlorophyll ‘a’	Chlorophyll ’b’
1. Molecular formula is C₅₅ H₇₂ O₅ N₄ Mg.	Molecular formula is C₅₅ H₇₀ O₆ N₄ Mg.
2. It is bluish green in colour.	It is olive green in colour.
3. It is universal and found in lower and higher plants except bacteria.	3. It is found only in higher plants.
4. It has methyl group attached to the third carbon of porphyrin head.	4. It has –CHO group attached to the third carbon atom of porphyrin head.